includes/collation/CollationFa.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 /**
  22  * Temporary workaround for incorrect collation of Persian language ('fa') in ICU (bug T139110).
  23  *
  24  * 'ا' and 'و' should not be considered the same letter for the purposes of collation in Persian.
  25  *
  26  * @since 1.29
  27  */
  28 class CollationFa extends IcuCollation {
  29         private $tertiaryCollator;
  30
  31         public function __construct() {
  32                 parent::__construct( 'fa' );
  33                 $this->tertiaryCollator = Collator::create( 'fa' );
  34         }
  35
  36         public function getPrimarySortKey( $string ) {
  37                 $firstLetter = mb_substr( $string, 0, 1 );
  38                 if ( $firstLetter === 'و' || $firstLetter === 'ا' ) {
  39                         return $this->tertiaryCollator->getSortKey( $string );
  40                 }
  41
  42                 return parent::getPrimarySortKey( $string );
  43         }
  44 }